Multiple-drill attachment for drill-presses.



No. 783,719- PATENTED JULY 14, 1903. F. A. KEHL & W. GOERS.

MULTIPLE DRILL ATTAGHMENT FOR DRILL PRESSES.

APPLICATION FILED MAY 26, 1902.

2 SHEETS-SHEET 1* N0 MODEL.

Attorneys.

No. 733,719. PATBNTED JULY 14, 1908.

I. A. KEHL & W. GOERS.

MULTIPLE DRILL ATTACHMENT FOR DRILL DRESSES.

APPLICATION FILED MAY 26, 1902.

N0 MODEL. 2 SHEETS-SHEBT 2.

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UNirEn STATES Patented Jul 14, 1903. I

PATENT OFFICE.

MULTIPLE-DRILL ATTACHMENT FOR DRILLyPRESSES.

SPECIFICATION formingpart Of Letters Patent N 0. 733,719, dated July 14,1903.

Application filed May 26, 1902. Serial No. 108,921. No model-l T0 (tZZwhmn it may concern.-

Be it known that we, FRANK A. KEHL and \VILLIAM GOERS, citizens of theUnited States, residing at Detroit, county of lVayne, State of Michigan,have invented a certain new and useful Improvement in Multiple- DrillAttachments for Drill-Presses; and we declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it pertains to make and use the same,reference being had to the accompanying drawings, which form a part ofthis specification.

This invention relates to drilling-machines, and has for its object animproved attachment intended to be used with drill-presses ordrilling-machines in which a large number of small regularly-arrangeddrills are contemporaneously driven by the single spindle of thedrill-machine.

The attachment is especially intended to be used for the purpose ofdrilling holes in the burners of gas-stoves; but it may be used withadvantage where it is desired to employ a larger number ofregularly-arranged or regularly-grouped holes, and it will facilitatethe rapidity of the work as well as its regularity.

The attachment consists of a plate arranged to hold a large number ofsmall drill-spindles in fixed relation with respect to the bearingthrough which the main drill-spindle works, and it is arranged to driveall the spindles of the many drills which are employed by means of asingle master-wheel, which rotates on the main spindle of thedrill-press and from which motion is communicated to the smallerspindles by a number of submaster-wheels, each of which drives severalof the small spindles, and by idlers which take up and carry forwardmotion, carrying it from one small spindle to another beyond the rangeof the sub-- master-wheels.

In the drawings, Figure 1 is a plan view showing the attachment of thesmall spindles of the individual drills and the attachment of the masterand of the submaster wheels and of the idlers. This drawing is ratherdiagrammatic than pictorial. Fig. 2 is a vertical section or a sectionalong the axis of a drillspindlc A, and it is taken at the line a a ofFig. 1. Fig. 3 is a section along the axis of the drill-spindle A andtaken at the line b b of 1. Fig. 4c is a detail of a single smallspindle and shows the means of holding the drill therein.

A indicates the spindle of a drill-press, gen erally placed in avertical position and driven in bearings 2, which are arranged at theend of a bracket 011 the frame of the drill-press. To the bearing 2 issecured a collar at, which collar is secured tothe top plate at of theattachment.

The attachment consists of a main or body part 5, to which is secured,by screws or bolts, a cap-bearing plate 15, and this cap-bearing plateis provided with an annular collar 10, to the upper side of which issecured the top plate 4, by means of which the entire attachment is heldto the drill-spindle. The main or body-plate 5 is provided with a largenumber of cavities that are nearly circular in cross-section and whichextend into the bodyplate for substantially halfits thickness orslightly less than half its thickness. The circular cavities intersecteach other or run into each other, and there are several sections in theplate in' which a number of circular cavities intersect in the waymentioned.

By referring to Fig. 1 there will be seen at the part shown as brokenaway a section containing a number of such cavities that inter sect eachother, and there also appears the half of a second section in the partbroken away. At other parts of the drawings similar cavities areindicated by dotted lines. Each section contains cavities in which canbe placed the submaster-wheel 9, which is intermediate with and betweenthe master-wheel 6 and the smaller drill-spindle wheels, here inaftermentioned, and also in which can be placed the spindle-wheels a b e (Z cfg h t, and also in which can be placed transfer-idlers 1 1" 1 1. Thecavities for the several gearwheels extend to substantially the samedepth in the body part 5 and intersect each other to allow of theintermeshing of the several wheels. The submaster-wheel 9 is journaledon a screw-stud 9, the upper end of which is supported in the ring 10.The submasterwheel 9 is preferably centered in a line which isintermediate between the inner circumference and the outer circumferenceof the ring 10, and the arbor of the submaster-wheel is thus held atboth ends in a firm bearing.

The toothed part of the wheel projects above the upper surface of thecap-bearing plate 15, and its extending portion engages with themaster-wheel 6, which is keyed to the spindle A. The end of thesubmaster-wheel 9, which is in the cavity, engages with a number ofindividual drill-spindle gears, which are journaled at their upper endin the cap-bearing plate 15 bypointed orcone bearings, and axles extendthrough the body plate 5 and terminate at their protruding lower endwith chucks for holding the individual drills.

As shown in Fig. 1, there are in direct engagement with eachsubmaster-wheel 9 five individual drill-spindle gears, two of which arein the-radial line on the opposite side of the submaster-wheel 9. Thesmall or individual drill-spindle gears 1 actuate an offsetidler 1',which intermeshes with a third drillspindle gear, and this intermesheswith an offset-idler 1, which in turn aetuates the outermost of theradially-arranged individual spindles in one radial line of gears, andso also the gear-wheel g actuates an idler 1, which actuates the thirdgear-wheel in another radial line of gears. The gear 72 actuates anidler 1 which actuates the outermost gear 1'. From each submaster-wheel9, as shown in this drawing, are actuated nine individualdrill-spindles, each of which has an upper bearing in the cap-plate 15and a lower bearing or spindle-bearing through the body plate 5, and allof which receive their primary actuation from the master-wheel 6 and thespindle A, and the holdingplates in which they are contained arestationarily fixed on the bearing 2, through which the spindle A isjournaled.

Each individual spindle E is provided with a square socket 17 and issplit at its lower extremity. It is provided with a threaded part 18back of the socket, and its lower extremity is coned as well as split.An internally-coiled cap 19, provided with an internal thread, isarranged to be run over the lower point of the spindle, and these parts,taken together, comprisea chuckin which the small drills can be held.

In assembling the various parts the individual drill-spindles with thecone-caps removed but with their gears attached to them, preferably madeintegral with them, are inserted from the upper side through the bodypart 5, the chuck-caps 19 are run into place, the subm aster-wh eels 9are dropped into their cavities on their bearing-stud 9, the masterwheel6 is dropped into place, and the top plate 4 placed over the ring of thecap-bearing plate and secured thereto by screws. (See at 20 in Fig. 2.)

To use the device, it is placed on the spindle A of the drill-press withthe key 73 in place and is held properly by set-screws 3, that passthrough suitably-threaded holes in the collar 4: and engage against thebearing 2. Vhen motion is given to the drill-spindle A, the individualdrills rotate at equal speeds and at a higher rate of speed than that ofthe main spindle A, and the individual drills are all protected fromdanger of breakage by the long bearings which each spindle has in thebody 5 and by the long bearing which each drill has in its socket, andthey are especially protected by the regularity and equality of thespeed of all the drills.

Vhat we claim is In an attachment for drilLpresses, the combination of abody-plate arranged to be held to a fixed part of a drill-press,individual drill-spindles engaging through said bodyplate and havingindividual gear-wheels arranged in cavities in said body-plate, acapbearing plate for the ends of said individual drill-spindles, asubmaster-wheel journaled in bearings that are fixed with. respect tosaid bod y-plate an d arranged to engage a plurality of individual drillgear wheels, a masterwheel arranged to be actuated by the maindrill-spindle and to engage the submasterwheel, substantially asdescribed.

In testimony whereof we sign this speci tication in the presence of twowitnesses.

FRANK A. KEHL. \VILLIAM GOERS.

Witnesses:

CHARLES F. BURTON, ELLIOTT J. STODDARD.

